(This is super bad, just a warning.)
This is the backstory. Gaster created Sans and Papyrus with pieces of his hands and during that process his soul chipped. He used that piece of his soul to create a third skeleton her name was Chewy or Chu for short. This was when the core was still new and was just being created.
11 years later. Chu is with Sans. They are going to see Papyrus. The phone started ringing. “ Hey Pap,What. Yes. Okay. Bye ” “What was Pap talking about?” “ Dad needs help, are you coming Chu?” “Is that a pun Sans?” “Maybe.” We got to the lab I could tell something was wrong, there was a strange smell and smoke coming out of the door. The door was locked so Sans teleported us into the lab. Dad was frantic “ What are you doing in here it's not safe!” As Sans landed I was slammed into a beaker of pure DETERMINATION. I threw up and fell over. Pap ran up to me and asked if I’m okay. I see flashing lights and Gaster yells something inaudible. I feel sick, I hear screams and feel burning sensation on my side . I hear a loud boom and then hear ringing.
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SoulCoreTale
Fanfiction(This is a old Undertale AU I made a while ago, so it's pretty bad.) What if Sans and Papyrus had a sister? What if something bad happened, and (almost) all the monsters? Here's the story of how Chewy turned into SoulCore.
